P
US4115508AExpiredUtilityPatentIndex 78

Polymers and rotationally molding same

Assignee: PHILLIPS PETROLEUM COPriority: May 31, 1977Filed: May 31, 1977Granted: Sep 19, 1978
Est. expiryMay 31, 1997(expired)· nominal 20-yr term from priority
Inventors:HUGHES JAMES K
C08K 5/14B29K 2105/24B29K 2023/06B29C 41/003C08K 3/04B29C 41/04
78
PatentIndex Score
26
Cited by
5
References
22
Claims

Abstract

A composition that can be rotationally molded with a minimum formation of bubbles comprises solid polymer, a cross-linking agent, a solid pigment in an amount to provide a surface area up to 30 m 2 /100 grams of polymer, and a transition metal catalyst residue content of less than about 3 parts per million.

Claims

exact text as granted — not AI-modified
What is claimed is: 
     
       1. A composition of matter comprising a solid polymer, an acetylenic diperoxy compound and a carbon black wherein the solid polymer is selected from the group consisting of ethylene hompolymers, copolymers of ethylene and at least one acyclic mono-1 olefin hydrocarbon having 3 to 8 carbon atoms per molecule, and mixtures thereof,   wherein the amount of the acetylenic diperoxy compound is a crosslinking amount and the acetylenic diperoxy compound is selected from the group consisting of hexynes having the formula ##STR3## octynes having the formula ##STR4## and octadiynes having the formula ##STR5## wherein R is selected from the group consisting of tertiary alkyl, alkyl carbonate, and benzoate; and   wherein the amount of the carbon black is an amount to provide a surface area using nitrogen according to ASTM D 3037-76 of up to about 30 m 2  /100 g of polymer; and   wherein said polymer has a transition metal catalyst residue content of less than about 3 parts per million.   
     
     
       2. The composition of matter according to claim 1 wherein the surface area of the carbon black is less than 25 m 2  /100 g of polymer and the transition metal catalyst residue content is 2 parts per million or less. 
     
     
       3. The composition of matter according to claim 1 wherein the amount of the acetylenic diperoxy compound ranges from about 0.1 to about 10 weight percent based on the weight of polymer. 
     
     
       4. The composition of matter according to claim 1 wherein the amount of the acetylenic diperoxy compound ranges from about 0.2 to about 5 weight percent based on the weight of polymer. 
     
     
       5. The composition of matter according to claim 1 wherein the amount of the acetylenic diperoxy compound ranges from about 0.5 to about 1 weight percent based on the weight of polymer. 
     
     
       6. The composition of claim 1 wherein the polymer is polyethylene, the acetylenic diperoxy compound is 2,5-dimethyl-2,5-di(t-butylperoxy)hexyne-3, the carbon black is selected from the group of carbon blacks within groups 5 to 9 as shown in ASTM D 2516-75, and the transition metal catalyst residue is a chromium metal in an amount of 2 parts per million or less. 
     
     
       7. The composition of matter of claim 6 wherein the carbon black is a group 5 carbon black as shown in ASTM D 2516-75 and the chromium catalyst residue content is 1 part per million or less. 
     
     
       8. A method for reducing the formation of bubbles in rotationally molded articles comprising rotationally molding a composition of matter comprising a solid polymer, an acetylenic diperoxy compound and a solid pigment wherein the solid polymer is selected from the group consisting of ethylene homopolymers, copolymers of ethylene and at least one acyclic mono-1 olefin hydrocarbon having 3 to 8 carbon atoms per molecule, and mixtures thereof,   wherein the amount of the acetylenic diperoxy compound is a crosslinking amount and the acetylenic diperoxy compound is selected from the group consisting of hexynes having the formula ##STR6## octynes having the formula ##STR7## and octadiynes having the formula ##STR8## wherein R is selected from the group consisting of tertiary alkyl, alkyl carbonate, and benzoate; and   wherein the amount of the solid pigment is an amount to provide a surface area using nitrogen according to ASTM D 3037-76 of up to about 30 m 2  /100 g of polymer; and   wherein said polymer has a transition metal catalyst residue content of less than about 3 parts per million.   
     
     
       9. The method of claim 8 wherein the rotational molding temperature ranges from about 350° to about 700° F. (177° to 371° C.). 
     
     
       10. The method of claim 8 wherein the rotational molding temperature ranges from about 450° to about 625° F. (232° to 329° C.). 
     
     
       11. The method of claim 8 wherein the rotational molding temperature ranges from about 525° to about 625° F. (274° to 329° C.). 
     
     
       12. The method of claim 8 wherein the surface area of the solid pigment is less than 25 m 2  /100 g of polymer and the transition metal catalyst residue content is 2 parts per million or less. 
     
     
       13. The method of claim 8 wherein the amount of the acetylenic diperoxy compound ranges from about 0.1 to about 10 weight percent based on the weight of polymer. 
     
     
       14. The method of claim 8 wherein the amount of the acetylenic diperoxy compound ranges from about 0.2 to 5 weight percent based on the weight of polymer. 
     
     
       15. The method of claim 8 wherein the amount of the acetylenic diperoxy compound ranges from about 0.5 to about 1 weight percent based on the weight of polymer. 
     
     
       16. The method of claim 8 wherein the polymer is polyethylene, the acetylenic diperoxy compound is 2,5-dimethyl-2,5-di(t-butylperoxy)hexyne-3, the solid pigment is selected from the group of carbon blacks within groups 5 to 9 as shown in ASTM D 2516-75, and the transition metal catalyst residue is a chromium metal in an amount of 2 parts per million or less. 
     
     
       17. The method of claim 16 wherein the carbon black is a group 5 carbon black as shown in ASTM D 2516-75 and the chromium catalyst residue content is 1 part per million or less. 
     
     
       18. A composition of matter in accordance with claim 3 wherein the amount of the acetylenic diperoxy compound is not more than about 1 weight percent based on the weight of polymer. 
     
     
       19. A composition of matter comprising a solid polymer, an acetylenic diperoxy compound and a solid pigment wherein the solid polymer is selected from the group consisting of ethylene homopolymers, copolymers of ethylene and at least one acyclic mono-1 olefin hydrocarbon having 3 to 8 carbon atoms per molecule, and mixtures thereof,   wherein the amount of the acetylenic diperoxy compound is a crosslinking amount and the acetylenic diperoxy compound is selected from the group consisting of hexynes having the formula ##STR9## octynes having the formula ##STR10## and octadiynes having the formula ##STR11## wherein R is selected from the group consisting of tertiary alkyl, alkyl carbonate, and benzoate; and   wherein the amount of the solid pigment is an amount to provide a surface area using nitrogen according to ASTM D 3037-76 of up to about 30 m 2  /100 g of polymer; and   wherein said polymer has a transition metal catalyst residue content of less than about 3 parts per million.   
     
     
       20. A composition of matter in accordance with claim 19 wherein the solid pigment is selected from the group consisting of carbon black and iron oxide. 
     
     
       21. A method in accordance with claim 8 wherein the amount of the acetylenic diperoxy compound is not more than about 1 weight percent based on the weight of polymer. 
     
     
       22. A method in accordance with claim 8 wherein the solid pigment is selected from the group consisting of carbon black and iron oxide.

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